The order can contain multiple reservations.
The Reservation is actually the time and details of the specific visit.
For example, how many seats are reserved, what price options are chosen, etc.
The reservation has a unique code in the format like A1B2C3.
And the Order is information about the person who booked, when he did it, how did he pay etc.
The order includes contact information, payments, confirmation status, etc.
The order has a unique number of 9 random digits like 593235837.
If you compare reservations with a regular online store, then an order is a shopping cart, and a reservation is a product.
You can create tables that display information about the orders, the reservations or both in the combined mode,
where under each order row you will see the rows of its reservations.